DTC Troubleshooting: U0131 (126)
DTC U0131:
 F-CAN Malfunction (ECM-EPS Control Unit)
NOTE: Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information.
  1. Turn the ignition switch ON (II).
  1. Check for Temporary DTCs or DTCs with the HDS.
Are DTC U0028 and U0131 indicated at the same time?
YES -
Go to troubleshooting for DTC U0028. ■
NO -
Go to Step 3 .
  1. Clear the DTC with the HDS.
  1. Check for Temporary DTCs or DTCs with the HDS.
Is DTC U0131 indicated?
YES -
Go to Step 5 .
NO -
Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the gauge control module (tach), the EPS control unit, and the ECM.■
  1. Check for communication the EPS system with the HDS.
Does the HDS communicate with the EPS control unit?
YES -
Go to Step 6 .
NO -
Go to the DLC circuit troubleshooting. ■
  1. Turn the ignition switch OFF.
  1. Jump the SCS line with the HDS.
  1. Disconnect EPS control unit connector D (28P).
  1. Disconnect ECM connector A (44P).
  1. Connect ECM connector terminal A36 to body ground with a jumper wire.